Mojo: Convert OVERRIDE -> override in mojo/{embedder,system}.

mojo/system/channel.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_SYSTEM_CHANNEL_H_
 #define MOJO_SYSTEM_CHANNEL_H_
 
 #include <stdint.h>
 
 #include "base/compiler_specific.h"
@@ skipping 114 matching lines @@
     return platform_support_;
   }
 
  private:
   friend class base::RefCountedThreadSafe<Channel>;
   virtual ~Channel();
 
   // |RawChannel::Delegate| implementation (only called on the creation thread):
   virtual void OnReadMessage(
       const MessageInTransit::View& message_view,
-      embedder::ScopedPlatformHandleVectorPtr platform_handles) OVERRIDE;
-  virtual void OnError(Error error) OVERRIDE;
+      embedder::ScopedPlatformHandleVectorPtr platform_handles) override;
+  virtual void OnError(Error error) override;
 
   // Helpers for |OnReadMessage| (only called on the creation thread):
   void OnReadMessageForDownstream(
       const MessageInTransit::View& message_view,
       embedder::ScopedPlatformHandleVectorPtr platform_handles);
   void OnReadMessageForChannel(
       const MessageInTransit::View& message_view,
       embedder::ScopedPlatformHandleVectorPtr platform_handles);
 
   // Removes the message pipe endpoint with the given local ID, which must exist
@@ skipping 38 matching lines @@
   // be checked for existence before use.
   MessageInTransit::EndpointId next_local_id_;
 
   DISALLOW_COPY_AND_ASSIGN(Channel);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_SYSTEM_CHANNEL_H_